• Title/Summary/Keyword: Gas generate

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Seismic properties of Gas Hydrate using Modeling Technique (모델링 기술을 이용한 심해 Gas Hydrate의 탄성파 특성 연구)

  • Shin, Sung-Ryul;Yeo, Eun-Min;Kim, Chan-Su;Kim, Young-Jun;Park, Keun-Pil;Lee, Ho-Young
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.11a
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    • pp.156-157
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    • 2005
  • Gas hydrate is ice-like crystalline lattice, formed at appropriate temperature and pressure, in which gas molecules are trapped. It is worldwide popular interesting subject as a potential energy. In korea, a seismic survey for gas hydrate have performed over the East sea by the KIGAM since 1997. In this paper, we had conducted numerical and physical modeling experiments for seismic properties on gas hydrate with field data which had been acquired over the East sea in 1998. We used a finite difference seismic method with staggered grid for 2-D elastic wave equation to generate synthetic seismograms from multi-channel surface seismic survey, OBC(Ocean Bottom Cable) and VSP(Vertical Seismic Profiling). We developed the seismic physical modeling system which is simulated in the deep sea conditions and acquired the physical model data to the various source-receiver geometry. We carried out seismic complex analysis with the obtained data. In numerical and physical modeling data, we observed the phase reversal phenomenon of reflection wave at interface between the gas hydrate and free gas. In seismic physical modeling, seismic properties of the modeling material agree with the seismic velocity estimated from the travel time of reflection events. We could easily find out AVO(Amplitude Versus Offset) in the reflection strength profile through seismic complex analysis.

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A Study on the Characteristics of Silicon Nanopowders Produced by Transferred Type Arc Plasma Apparatus (이송식 아크플라즈마 장치에 의해 제조된 실리콘 나노분말의 특성에 대한 연구)

  • Kan, Woo-Seop;Park, Sang-Hee
    • Journal of the Korean Society of Industry Convergence
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    • v.24 no.6_2
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    • pp.909-917
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    • 2021
  • This study was carried out experimentally on the production and properties of silicon nanopowders characteristics using a transferred type arc plasma apparatus. To investigate the properties of silicon nanopowder, the purity of argon gas(99.999%, 99.9%) and the partial pressure ratio of nitrogen gas(0~90%) were varied. The total pressure in chamber is 400Torr and the silicon chunk amount used as raw material is 300g. The power supplied to the cathode to generate arc plasma was 9~12kW/h, and the electrode was made of tungsten and graphite with a diameter of 13mm. The particle size, impurity elements and powder evaporation rate of the silicon powder were analyzed using the XRD, FE-SEM, TEM and electronic scale. According to the purity of argon gas, the silicon evaporation rate and the particle size were similar, and impurities were generated more in the case of 99.9% purity than 99.999%. When argon gas and nitrogen gas were mixed in the chamber, the silicon evaporation rate and particle size increased as the partial pressure ratio of nitrogen gas increased. In particular, when the partial pressure ratio of nitrogen gas was 80%, the silicon evaporation rate 80g/h, and the particle size was about 80~100nm.

Non-Thermal Plasma Technique for Removing $SO_2$ and $NO_x$ from Combustion Flue Gas (연소가스내 탈황탈질처리를 위한 저온 플라즈마 기술)

  • Song, Yeong-Hun;Sin, Wan-Ho;Kim, Seok-Jun;Jang, Gil-Hong
    • 한국연소학회:학술대회논문집
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    • 1997.06a
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    • pp.69-76
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    • 1997
  • Industrial-scale pulse corona process to remove $SO_2$ and $NO_x$ simultaneously from combustion flue gas has been studied. The pilot plant built in the present study treats 2,000 $Nm^3$/hr of flue gas from a boiler. The geometry of the pulse corona reactor is similar to that of an electrostatic precipitator commonly used in industry, A thyratron switch and magnetic pulse compressors, which can generate up to 130 kV of peak pulse voltage and up to 30 kW of average pulse power, have been used to produce pulsed corona. The removal efficiencies of $S0_2$ and $NO_x$ with the present process are maximum of 95 % and 85 %, respectively. Electrical power consumption to produce the pulsed corona, which has been one of the major difficulties to apply this process to industry, has been evaluated in the present study. The results showed that the power consumption can be reduced significantly by simultaneous addition of hydrocarbon injection and heterogeneous phase reactions to the process.

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Integrated Building Energy Supply System : An Overview of Technical Trends for Gas Engine Driven Combined Heat and Power System (가스엔진 구동 건물에너지 통합 공급시스템 개발을 위한 기술동향 사례연구)

  • Park, Beungyong;Jeong, Yongdae;Shin, Hyunchul;Cho, Jinkyun
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.29 no.11
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    • pp.612-620
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    • 2017
  • Power consumption in Southeast Asia is steadily increasing due to industrialization and the effects of hot and humid climates. However, there are not enough energy generation facilities and infrastructures to meet the growing demand because it is difficult to secure the construction and operation costs of the transmission and distribution systems. This study aims to develop a gas engine driven heat pump system that supplies heating, cooling and electric power to buildings. This system, besides its normal function to produce heat, has the capacity to generate electricity on a household level. This paper investigates similar cases overseas before developing the system. Through the investigation of commercialized similar systems, the level of technology and market trend of development system were identified. Features and specifications of commercial and industrial systems will be used for system development.

A Study on Compressor Map Generation of a Gas Turbine Engine Using Hybrid Intelligent Method (하이브리드 기법을 이용한 가스터빈 엔진의 압축기 성능선도 생성에 관한 연구)

  • Kong, Chang-Duk;Kho, Seong-Hee;Ki, Ja-Young
    • Journal of the Korean Society of Propulsion Engineers
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    • v.10 no.4
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    • pp.54-60
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    • 2006
  • A method for generating the compressor map from some performance measuring data using the hybrid intelligent technique was newly proposed. In order to improve accuracy of the traditional scaling method, a method to generate the compressor map using the GAs(Genetic Algorithms) was previously proposed, but the method has a drawback that it can not find correctly surge and choke points of the compressor map. However, the proposed hybrid intelligent method can determine obviously those points as well as improve the accuracy of the compressor map through complementarily using the GAs and the scaling method.

An Experimental Study on UNDEX Characteristics of Airbag Inflators (에어백 인플레이터의 수중폭발 특성에 대한 실험 연구)

  • Kim, Hyeongjun;Choi, Gulgi;Na, Yangsub;Park, Kyung Hoon;Chung, Hyun
    • Journal of the Society of Naval Architects of Korea
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    • v.54 no.5
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    • pp.439-446
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    • 2017
  • This paper deals with an experimental study of the dynamics of an underwater bubbles and shock waves, generated by rapid underwater release of highly compressed gas. Aribag inflators, which are used for automobile's airbag system, are used to generate the extremely-rapid underwater gas release. Experimental studies of the complex underwater bubble dynamics as well as underwater shock wave were carried out in a specifically designed cylindrical water tank. The water tank is equipped with a high-speed camera and pressure sensors. The high-speed camera was used to capture the expansion and collapse of the gas bubble created by inflators, while pressure sensors was used to measure the underwater shock propagation and magnitudes. The experimental results were compared against the results of explosion of pentolite explosive. Several physical phenomena that has been observed and discussed, which are different from the explosive underwater explosion.

The Energy Performance & Economy Efficiency Evaluation of Micro Gas Turbine Installed in Hospital (대형병원 건물에 마이크로 가스터빈 적용을 위한 에너지성능 및 경제성 평가)

  • Kim, Byoung-Soo;Hong, Won-Pyo
    • Journal of the Korean Solar Energy Society
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    • v.29 no.5
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    • pp.8-13
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    • 2009
  • Feasibilities of the application of a micro gas turbine cogeneration system to a large size hospital building are studied by estimating energy demands and supplies. The energy demand for electricity is estimated by surveying and sorting the consumption records for various equipment and devices. The cooling heating, and hot water demands are further refined with TRNSYS and ESP-r to generate load profiles for the subsequent operation simulations. The operation of the suggested cogeneration system in conjunction with the load data is simulated for a time span of a year to predict energy consumption and gain profile. The simulation revealed that the thermal efficiency of the gas turbine is about 30% and it supplies 60% of the electricity required by the building. The recovered heat can meet 56% of total heating load and 67% of cooling, and the combined efficiency reaches up to 70%.

A Feasibility Study on the Cold Hollow Cathode Gas Ion Source for Multi-Aperture Focused Ion Beam System (다개구 이온빔 가공장치용 냉음극 방식의 가스 이온원의 가능성 평가에 관한 연구)

  • Choi, Sung-Chang;Kang, In-Cheol;Han, Jae-Kil;Kim, Tae-Gon;Min, Byung-Kwon
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.3
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    • pp.383-388
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    • 2011
  • The cold hollow cathode gas ion source is under development for multi aperture focused ion beam (FIB) system. In this paper, we describe the cold hollow cathode ion source design and the general ion source performance using Ar gas. The glow discharge characteristics and the ion beam current density at various operation conditions are investigated. This ion source can generate maximum ion beam current density of approximately 120 mA/$cm^2$ at ion beam potential of 10 kV. In order to effectively transport the energetic ions generated from the ion source to the multi-aperture focused ion beam(FIB) system, the einzel lens system for ion beam focusing is designed and evaluated. The ions ejected from the ion source can be forced to move near parallel to the beam axis by adjusting the potentials of the einzel lenses.

Optimization Study on the Open-Loop Rankine Cycle for Cold Heat Power Generation Using Liquefied Natural Gas (액화천연가스를 활용한 개방형 랭킨 사이클에 적용한 냉열 발전의 최적화에 대한 연구)

  • KIM, YOUNGWOO;LEE, JOONGSUNG;LEE, JONGJIP;KIM, DONG SUN;CHO, JUNGHO
    • Transactions of the Korean hydrogen and new energy society
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    • v.28 no.3
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    • pp.295-299
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    • 2017
  • In this study, computer simulation and optimization works have been performed for an open-loop Rankine cycle to generate power using five cases of liquefied natural gas compositions. PRO/II with PROVISION V9.4 from Schneider electric company was used, and the Soave-Redlich-Kwong equation of the state model was utilized for the design of the power generation cycle. It was concluded that more power was obtained from less molecular weight liquefied natural gas since there was more volumetric flow rate with less molecular weight.

A study of jet dispersion and jet-fire characteristics for safety distance of the hydrogen refueling station (수소충전소 안전거리 설정을 위한 수소제트 및 화염 특성 분석)

  • Kang, Seung-Kyu
    • Journal of the Korean Institute of Gas
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    • v.23 no.6
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    • pp.74-80
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    • 2019
  • Hydrogen refueling stations that use compressed hydrogen at high pressure provide safety distances between facilities in order to ensure safety. Most accidents occurring in hydrogen stations are accidental leaks. When a leak occurs, various types of ignition sources generate a jet flame. Therefore, the analysis of leaked gas diffusion and jet flame due to high pressure hydrogen leakage is one of the most important factor for setting the safety distance. In this study, the leakage accidents that occur in the hydrogen refueling station operated in high pressure environment are simulated for various leakage source sizes. The results of this study will be used as a reference for the future safety standards.